M
AVTMMTO3xx Rev 3 Sept 2013
26
d. Resistance Stability – This is a pull-down item to select the level for
acceptable resistance reading stability from one period of time (average data
for 1 to 5 seconds) vs. a second period of time (average data for 6 to 10
seconds).
i. 99%
ii. 99.5%
iii. 99.75%
iv. 99.825%
NOTE: Due to the nature of this measurement, the user will have to wait during
the acquisition cycle for a minimum of the time period specified to assure
good stability numbers. Software will start at zero and work toward
100% stability with time and stable measurements.
e. Resistance Time Limit for valid reading - This is a pull-down item to select
the amount of time before a reading is verified as stable. 10 seconds was used
in the stability reading example. For large transformers, it may be necessary
to extend the period to assure stable readings. Extending the Time Limit will
also increase the averaging routine improving low value readings.
i. 10 seconds
ii. 20 seconds
iii. 40 seconds
iv. 80 seconds
v. 180 seconds
f. Save and Close – button to accept and exit Instrument Setup.
g. Cancel and Close – button to cancel and exit Instrument Setup.
h. Status Window – Much clearer description of sections on the screen for
those of you who do not like reading manuals.
17. Testing the transformer requires the user to decide a method of testing. To simplify
this process, PowerDB has included a Test Wizard to assure the customer
understands the testing method to choose. For a single winding transformer, there
are basically two methods of testing the transformer. The first method would be to
test the High Side, record the information and test the Low Side and record the
information. This method of testing is beneficial if the high side resistance is much
larger than the low side resistance. The high side resistance can be tested at 1 amp
and the low side resistance can be measured at 10 amps. The second method of
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